[Bug 292921] stty delete issue on Honeycomb LX ARM64 Console

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=292921

            Bug ID: 292921
           Summary: stty delete issue on Honeycomb LX ARM64 Console
           Product: Base System
           Version: 16.0-CURRENT
          Hardware: arm64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: arm
          Assignee: freebsd-arm@FreeBSD.org
          Reporter: editor@callfortesting.org

Previous working versions: 14.x

Problematic version: 16.0-CURRENT main-n283573-a8e92198f854 GENERIC arm64
installed via the GENERIC ARM64 memstick installer

Visible on: Serial console and over SSH

First sign of trouble via SSH:

(freebsd@honeycomb) Password for freebsd@arm\010\010\010on\010\010honeycomb:

Interactive issue:

<space><space><backspace> under typescript gives:

root@arm^H^H^Hon^H^Hhoneycomb:~ #   ^M^[[30C^M
root@arm^H^H^Hon^H^Hhoneycomb:~ # exit^M

Typing 'vi typescript' gets 10 spaces inserted:
vi ty          pescript

stty -a
speed 38400 baud; 31 rows; 80 columns;
lflags: icanon isig iexten echo echoe echok echoke -echonl echoctl
        -echoprt -altwerase -noflsh -tostop -flusho -pendin -nokerninfo
        -extproc
iflags: -istrip icrnl -inlcr -igncr ixon -ixoff -ixany imaxbel -ignbrk
        brkint -inpck ignpar -parmrk iutf8
oflags: opost onlcr -ocrnl tab0 -onocr -onlret
cflags: cread cs8 -parenb -parodd hupcl -clocal -cstopb -crtscts -dsrflow
        -dtrflow -mdmbuf rtsdtr
cchars: discard = ^O; dsusp = ^Y; eof = ^D; eol = <undef>;
        eol2 = <undef>; erase = ^?; erase2 = ^H; intr = ^C; kill = ^U;
        lnext = ^V; min = 1; quit = ^\; reprint = ^R; start = ^Q;
        status = ^T; stop = ^S; susp = ^Z; time = 0; werase = ^W;

'stty erase ^?' does not resolve it.

Filing this as a bug because the default behavior has changed and it makes
console interactivity difficult. What information would help diagnose this?

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